Add A2A server (Docker) for HF Space

Dockerfile

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+FROM python:3.11-slim
+
+# Optional: install system packages your agent needs
+WORKDIR /app
+
+# Install Python deps first (better layer caching)
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the rest of your code
+COPY . .
+
+# Start the server. HF injects $PORT; our main.py reads it.
+CMD ["python", "main.py"]
+

main.py

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+# main.py
+import os
+import uvicorn
+
+# ---- Adjust imports to match a2a-python ----
+# These paths are common in the tutorial; if yours differ, change them accordingly.
+from a2a.server.apps import A2AStarletteApplication
+from a2a.server.request_handlers import DefaultRequestHandler
+from a2a.server.tasks import InMemoryTaskStore
+
+# Example minimal executor
+class HelloWorldAgentExecutor:
+    async def call(self, message: str, **kwargs):
+        return {"text": f"Hello from A2A on HF Spaces! You said: {message}"}
+
+# Example minimal public AgentCard (adjust fields to your spec)
+AGENT_CARD = {
+    "name": "HF A2A Agent",
+    "version": "1.0",
+    "description": "A2A demo running on Hugging Face Spaces",
+    "endpoints": {
+        "send": "/message/send",
+        "stream": "/message/stream"
+    }
+}
+
+def build_app():
+    app = A2AStarletteApplication(
+        agent_card=AGENT_CARD,
+        http_handler=DefaultRequestHandler(
+            agent_executor=HelloWorldAgentExecutor(),
+            task_store=InMemoryTaskStore(),
+        ),
+        # extended_agent_card=...  # optional
+    ).build()
+    return app
+
+if __name__ == "__main__":
+    port = int(os.getenv("PORT", "7860"))  # HF provides PORT
+    uvicorn.run(build_app(), host="0.0.0.0", port=port)
+

requirements.txt

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+uvicorn>=0.30
+starlette>=0.37
+# The A2A library (adjust to the name/extra you use)
+a2a-python